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// <copyright>
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
namespace System.Activities.Debugger
{
using System.Collections.Generic;
using System.IO;
using System.Xml;
internal class XmlReaderWithSourceLocation : XmlWrappingReader
{
private Dictionary<DocumentLocation, DocumentRange> attributeValueRanges;
private Dictionary<DocumentLocation, DocumentRange> emptyElementRanges;
private Dictionary<DocumentLocation, DocumentRange> contentValueRanges;
private Dictionary<DocumentLocation, DocumentLocation> startElementLocations;
private Dictionary<DocumentLocation, DocumentLocation> endElementLocations;
private CharacterSpottingTextReader characterSpottingTextReader;
private Stack<DocumentLocation> contentStartLocationStack;
public XmlReaderWithSourceLocation(TextReader underlyingTextReader)
{
UnitTestUtility.Assert(underlyingTextReader != null, "CharacterSpottingTextReader cannot be null and should be ensured by caller.");
CharacterSpottingTextReader characterSpottingTextReader = new CharacterSpottingTextReader(underlyingTextReader);
this.BaseReader = XmlReader.Create(characterSpottingTextReader);
UnitTestUtility.Assert(this.BaseReaderAsLineInfo != null, "The XmlReader created by XmlReader.Create should ensure this.");
UnitTestUtility.Assert(this.BaseReaderAsLineInfo.HasLineInfo(), "The XmlReader created by XmlReader.Create should ensure this.");
this.characterSpottingTextReader = characterSpottingTextReader;
this.contentStartLocationStack = new Stack<DocumentLocation>();
}
public Dictionary<DocumentLocation, DocumentRange> AttributeValueRanges
{
get
{
if (this.attributeValueRanges == null)
{
this.attributeValueRanges = new Dictionary<DocumentLocation, DocumentRange>();
}
return this.attributeValueRanges;
}
}
public Dictionary<DocumentLocation, DocumentRange> ContentValueRanges
{
get
{
if (this.contentValueRanges == null)
{
this.contentValueRanges = new Dictionary<DocumentLocation, DocumentRange>();
}
return this.contentValueRanges;
}
}
public Dictionary<DocumentLocation, DocumentRange> EmptyElementRanges
{
get
{
if (this.emptyElementRanges == null)
{
this.emptyElementRanges = new Dictionary<DocumentLocation, DocumentRange>();
}
return this.emptyElementRanges;
}
}
public Dictionary<DocumentLocation, DocumentLocation> StartElementLocations
{
get
{
if (this.startElementLocations == null)
{
this.startElementLocations = new Dictionary<DocumentLocation, DocumentLocation>();
}
return this.startElementLocations;
}
}
public Dictionary<DocumentLocation, DocumentLocation> EndElementLocations
{
get
{
if (this.endElementLocations == null)
{
this.endElementLocations = new Dictionary<DocumentLocation, DocumentLocation>();
}
return this.endElementLocations;
}
}
private DocumentLocation CurrentLocation
{
get
{
return new DocumentLocation(this.BaseReaderAsLineInfo.LineNumber, this.BaseReaderAsLineInfo.LinePosition);
}
}
public override bool Read()
{
bool result = base.Read();
if (this.NodeType == Xml.XmlNodeType.Element)
{
DocumentLocation elementLocation = this.CurrentLocation;
if (this.IsEmptyElement)
{
DocumentRange emptyElementRange = this.FindEmptyElementRange(elementLocation);
this.EmptyElementRanges.Add(elementLocation, emptyElementRange);
}
else
{
DocumentLocation startElementBracket = this.FindStartElementBracket(elementLocation);
this.StartElementLocations.Add(elementLocation, startElementBracket);
// Push a null as a place holder. In XmlNodeType.Text part, we replace this
// null with real data. Why not pushing real data only without this place holder?
// Because in XmlNodeType.EndElement, we need to know whether there is Text. Think
// about situation like <a>Text1<b><c>Text2</c></b>Text3</a>
// So, each time an Element starts, we push a place holder in the stack so that Start
// and End don't mis-match.
this.contentStartLocationStack.Push(null);
}
int attributeCount = this.AttributeCount;
if (attributeCount > 0)
{
for (int i = 0; i < attributeCount; i++)
{
this.MoveToAttribute(i);
DocumentLocation memberLocation = this.CurrentLocation;
DocumentRange attributeValueRange = this.FindAttributeValueLocation(memberLocation);
this.AttributeValueRanges.Add(memberLocation, attributeValueRange);
}
this.MoveToElement();
}
}
else if (this.NodeType == Xml.XmlNodeType.EndElement)
{
DocumentLocation endElementLocation = this.CurrentLocation;
DocumentLocation endElementBracket = this.FindEndElementBracket(endElementLocation);
this.EndElementLocations.Add(endElementLocation, endElementBracket);
UnitTestUtility.Assert(
this.contentStartLocationStack.Count > 0,
"The stack should contain at least a null we pushed in StartElement.");
DocumentLocation contentStartLocation = this.contentStartLocationStack.Pop();
if (contentStartLocation != null)
{
DocumentLocation contentEnd = this.FindContentEndBefore(endElementLocation);
this.ContentValueRanges.Add(endElementLocation, new DocumentRange(contentStartLocation, contentEnd));
}
}
else if (this.NodeType == Xml.XmlNodeType.Text)
{
UnitTestUtility.Assert(this.contentStartLocationStack.Count > 0, "Adding Text with out StartElement?");
if (this.contentStartLocationStack.Peek() == null)
{
// no text was added since the last StartElement.
// This is the start of the content of this Element.
// <a>ABCDE</a>
// Sometimes, xml reader gives the text by ABC and DE in
// two times.
this.contentStartLocationStack.Pop();
this.contentStartLocationStack.Push(this.CurrentLocation);
}
}
return result;
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing)
{
if (this.characterSpottingTextReader != null)
{
((IDisposable)this.characterSpottingTextReader).Dispose();
}
this.characterSpottingTextReader = null;
}
}
private DocumentLocation FindStartElementBracket(DocumentLocation elementLocation)
{
return this.characterSpottingTextReader.FindCharacterStrictlyBefore('<', elementLocation);
}
private DocumentLocation FindEndElementBracket(DocumentLocation elementLocation)
{
return this.characterSpottingTextReader.FindCharacterStrictlyAfter('>', elementLocation);
}
private DocumentRange FindEmptyElementRange(DocumentLocation elementLocation)
{
DocumentLocation startBracket = this.FindStartElementBracket(elementLocation);
DocumentLocation endBracket = this.FindEndElementBracket(elementLocation);
UnitTestUtility.Assert(startBracket != null, "XmlReader should guarantee there must be a start angle bracket.");
UnitTestUtility.Assert(endBracket != null, "XmlReader should guarantee there must be an end angle bracket.");
DocumentRange emptyElementRange = new DocumentRange(startBracket, endBracket);
return emptyElementRange;
}
private DocumentRange FindAttributeValueLocation(DocumentLocation memberLocation)
{
UnitTestUtility.Assert(this.characterSpottingTextReader != null, "Ensured by constructor.");
DocumentLocation attributeStart = this.characterSpottingTextReader.FindCharacterStrictlyAfter(this.QuoteChar, memberLocation);
UnitTestUtility.Assert(attributeStart != null, "Read should ensure the two quote characters exists");
DocumentLocation attributeEnd = this.characterSpottingTextReader.FindCharacterStrictlyAfter(this.QuoteChar, attributeStart);
UnitTestUtility.Assert(attributeEnd != null, "Read should ensure the two quote characters exists");
return new DocumentRange(attributeStart, attributeEnd);
}
private DocumentLocation FindContentEndBefore(DocumentLocation location)
{
DocumentLocation contentEnd = this.FindStartElementBracket(location);
int linePosition = contentEnd.LinePosition.Value - 1;
// Line position is 1-based
if (linePosition < 1)
{
return this.characterSpottingTextReader.FindCharacterStrictlyBefore('\n', contentEnd);
}
else
{
return new DocumentLocation(contentEnd.LineNumber.Value, linePosition);
}
}
}
}
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